Drilling machine



Patented Febc, 1927.

GEORGE H.' GILMAN', 0F BELMONT, MASSACHUSETTS.

er' it; i1 i DRILLNG MACHINE.

Application inea Maren 13, 1923.v seraino. 624,845'.

My invention relates to tluidpressure motors and `gearing'V andv particularly but .not exclusively Ato a hammer rock drill having a motor and gearing :tor rotating the chuck.

My invention will be best understood from the` following description when read in the light ot the accompanying drawingsv showing one specific embodiment ot my invention-selected for illustrative purposes7 while the scopefoi'l my( invention willbe more particularly pointed out inthe appended claims.

In the drawings v v Fig. 1 .is a longitudinal section ot the Jforward part of a rock drill;

Fig. 2 is a section on the lineQ-Q of Fig. l; and i Fig. 3 is a section on the line 3 3 of Fig. 2.

Referring to the drawings and to the preferred embodiment ot' my invention I have shown a casing in which is mounted for recipro'cation a hammer piston 1 having the forward extension 3 which at the end of the 'forward stroke of the hammer piston'strikes the end vof the shank 5 of the drill steel 7. Rotatably mountedv in the forward end ofV the casing is a sectionalV chuck 9 which carries the shank ot' the drill steel in such manner that when the chuck rotates the drill steelmust rotate with it. f p p l As shown in the drawings the casing hereinbefore referred to includes a rearward cyl inder section 10 land a forward cylinder vsection 11 tor receiving the hammer piston.v a section 13 for receiving` the chuck, and separating the sections 11V and 13 asection 15 forreceiving the mechanism for rotating the chuck. All these sections as will be understood by those skilled in theartl are held in assembled relation by the four -V through bolts19. f

The rearward end 'of the chuck as -illustrated has an external bearing 21 at the 'front end ot the cylinder section 11, and forwardly oit this bearing `the chuck is provided with the external gear teeth 23. Surrounding the gear teeth 23 is a block25 which generally stated is ofV quadrilateral yexterior and is 'formed with an' opening provided with the internal gear teeth i7 in mesh with the external gear teeth V23 on the chuck. Surrounding the block 25is a member 29 which generally stated is in the former aV rectangular ring having at opposite sides reccasing section 13.

tangular projections 31 the upper. and lower' flatv sides `of which, slidably tit the upper and lowersides Lot recesses or chambers 33 Vin the casing section 15, `while the forward and rearward.v sides respectively slidably tit the forward end 'face 35 of the cylinder secieitftt tion 11 and the rearwardend 'ace37 of the i Internally the opposite vertical sides of the member 29 as viewed 1n Fig. 2 slidably tit the exterior vof the blockI i 2521s indicated at 39. n l y,

Rotatively mounted in the forward end of the cylindersection11l I have shown `tour Apins 41 which are formed with 'reduced 4eccentric portions 43 projecting into and sup.-

- porting the block'Q.l By this construction rotation o f the block 25 is'preventedrand it is constramedto gyrate in an orbit about the axis ofthe chuck. For causing` gyration` of theblock 25 I alternately admit andv eX- haust motive fluid'to and `from the opposite chambers 33 and -to andl from the chambers 45 between the upper and lower Vsides of the block l25 and member 29 as viewedlin 2;

For supplying the chambersy 45 with'mo tive fluid I haveshownthe casing section 11 provided with passages 47 which in any`.con

venient manner lead from themotive` Huid supply intake. for the machine and terminate in passages 49 opening on the forward end face 35 of the casing section-11. Formedvin the vblock V25,'are passages 51 which'lead from` theside of therblock in Contact .with the face 35 and opennintovthe -chambers A45,

For exhausting .the motive fluid fronti` the chambers 45 Iyherein form throughv the wall of thefmember 29 kpassages. 53. which as clearly shown in Fig.V 2 are adaptedl to thev exterior corners the y block 25v and thereby place the chambersf- 45 intocommunication with 'the vchambers 57' at the extebe moved into registry. with :grooves y55 at rior of the member 2.9,ithe chambers lyper- Y manently communicating with the. atmosphere by way of passages'` 59 formed through the wall of the casing section 15. f

,For admitting motive fluid to the cham bers 33v I herein form through the casing section'll a pair ofV passages'- 61; one-of which isishown in Fig. 3 and `whichas iiiv form passages 63which Ylead from. thevsu'liface of the extension 31 in Contact with the surface 35 to the end surfaces of the projections 3l so as to open kinto the chamber A33 and thereby conduct motive fluid to said chambers when said passages are moved into` registry with the passages 6l. i

For exhausting motive iiuidV from theV chambers 38 I herein provide the Vproyectionsl of the member 29 with passages 65 which when the member 29 is at the limits of its travelrcause one or the other of the chambers to be placed in communication with the adjacent 'chamber 5T and conse.-

vquently in communication with ythe atmosphere. .Y l y Generally stated'the operationof the de Y. vice described is as follows With Ythe parts in the position shown in Figs.`1 and 2 motive fluid is supplied by.

way of the'passages 49 and V51 to the upper chamber 45, whilst the lower chamber 45 is connected to the, atmosphere by way of the groove 55, passage 53,v chamber 57 `and passage 59 as shown at the lower right hand corner of Fig.r 2, and consequently the' block 25tends'to move downwardly with relation Vextreme positions.

to Qthe member'29 which'by `reason of the mountingof the block on the pins 4l causes the member 29to move towards one'of its Assuming the member Y 29 is moved to its right hand eXtreme position as viewed in Fig. Y2 the passages 61j and 63 for the right hand projection B1 are Vmoved into registry which supplies 'the right hand chamber 33 Vwith motive fluid, and as at this time the left hand projection 31, as viewed in Fig.V 2, is at the extreme of its movement tothe right the left handv passage 4V65 is plac'edin communication with the corresponding chamber'59 and inveonsequence the member 29k is forced to the left as viewed in Fig. 2. "This causes `further movement 'ofthe' block 25, and when 'the block 25V reaches the.4 lower limitof its travel as viewedlin Fig.` 2 motive fluid isadmitted to `they-lowerchamber and exhausted vfrom v.iiuidis admittedv tothe leftv hand chamber '5k i 33` and exhausted from the right hand chamber 33V which causes continued movement l and brings the parts again into the position 'Y cham-ber supplied.fr

shown by Fig. 2,1whichcompletes the cycle. By 'so arranging the parts vrI may obtain suitable pre-admission, compression and exhaustionofthe motive fluid and cause the/ motive fluid to act in one chamber eXpansively while it is being admittedto the` vnext successive nrwiii be Observed that the enel-nai aan 23 onfthechuck and the internal teeth 27 on the block 25 forma reduction gear, which in consequence the gyratory motion of the block 25 is effective to rotate the chuck at a speed much less than the speed of gyration of the block 25.

Although I have described for. purposes of" illustration one specific embodiment of my invention it is to'be understood that within the scope of my `invent-ion wide deviations y may be made therefrom without departing from the spirit of my invention.

Claimsv Y l. A rock drill having in combination a c vlinder, a hammer piston in said cylinder` ai chuck casing carried at the forward end of said cylinder, said chuck casing having a bore, a tubular ehuckfitting said bore andv Vbeing rotatably mounted therein, said chuck at its rearward end having a continuous series of external gear teeth, a pair of members surrounding said gear -teeth one of which is mounted inside the other for reciprocation relatively thereto, means other than said gear teeth on said chuck for positively enforcing a reciprocatory motion of one of said members and a gyratory motion of the other member, a continuous series of internalgear teeth carried bysaid member limited to a gyratory motion, said last named gear teeth meshing with said external gear teeth, and means for causing said motion of said members by fluid pressure.

2. A rock drill having in combination a cylinder, hammer piston in said cylinder, a chuck Vcasing carried at the forward endof said cylinder, said chuck casing having a bore, a tubulary chuck fitting said bore and being rotatably mounted therein, said chuck at its rearward end .having a continuous series of external gear teeth, a member mounted for gyration and having a continu'- ousvseries of internalV gear teeth lmeshing with said gear 4teeth carried by said chuck,

eccentric mechanism enforcing gyratory movement of said member, a member mounted for recipr'ocation andV relatively to which member said first named member is mounted for recipiocation, andmea'ns rfor causing Y Aconjoint motion of said membersby fluid pressure.

3. A rockV drill having in combination a cylinder, a hammer piston in usaid cylinder,

a chuck casing carried at the forward end of said cylinder, said chuck easing having a bore, a tubular chuck fitting said boreand being rotatably mounted therein, said chuck at its rearward end having a continuous series of external gear teeth, a `fluid pressureV motor for rotatingsaid chuck, said motor comprising a pair of members one of which is mounted on the VVother for Vreciprocation,

guiding means for causingone of said members vto vhave a reciprocatory motion andY other guiding means for causing the other member Vto have ai gyratory motion, and

lZi)

' `ed in' said Vfirst mentioned.member rfor re- Ciproczition relatively to said `first mentioned .Qmeinber and transversely to the reciprocationfot said lii'st mentioned niembei,"n pluiniityxo'l: eccentric supports for said second Ymember rotntively mounted in said casing, n direct gearing connection between seid sec f ondV .ineinberrzind i chuck, and means fitorY 'permitting' motive fluid to act between said members and between said first mentioned V*member and tlie casing for gii'iing motion. to

said members@ 1 Y 12; ln a roel; drill, ai casing containing n .lunniner piston indv a rotary, chuck, said casing.lnivingv mounted tlierein for recipro- Y cation .transiffeisely olf' said cliuclr a member.

'which surrounds. said chuck, zi secondmem- `ber surrouudin said chuck and mounted inr sid Ifirst Vmentioned member 'orfreciproczi.-

Ution relatively to saidrstinentioned memberend transversely to tlie i'eciprocation. of sind irstmentioned member,nv plurality ot eccentric,supports for said second member rotatably mountediin said casing and surY Vrounded by-A said first mentioned member, Vnd means for causing motive fluid to ict 'i upon atleast one of seid members for giving motion to seid members. e

13. ln a rock drill, iy casing, :i chuck roior cziusingsaid said chuck. f v

14; Inn rock drill, a casing, a chuck iogyrntory member to drive tetzibly mounted in said casingl and formed Vfor carrying e drill steel, a piston for operiating seid drillsteel, a fluid pressure motor for rotating seid chuck, saidmotor comprisingl aigyratory,meinbermounted upon ay plurality of independent eccentric members,

p .d eccentric members rotatably carried by sziid casing, guidingl means surrounding said gyritory member for preventing; rotation of said gyrzitory member, Aand ineens for onusing seid,` gyi'atory member to drive seid chuck. Y n i f u Y In testimony whereof, I Vlieve signed'fmy nzune to this speciliczttion;

suenen n. eiLMAN,

sov 

